All-in-one jigless projection loading system and body component assembling method using the same for vehicle

ABSTRACT

An all-in-one jigless projection loading system for a vehicle is adapted to load and assemble a body component to a vehicle body. The all-in-one jigless projection loading system may include: a fixing bracket fixed to an arm of a robot; a position adjusting member rotatably mounted to the fixing bracket; a gripper mounted to the fixing bracket to be movable backward and forward, and gripping the body component; an array unit mounted to the position adjusting member, and arraying the body component; and a welding unit mounted to the fixing bracket, and projection-welding the body component to a vehicle body.

CROSS-REFERENCE TO RELATED APPLICATION

The present application claims priority of Korean Patent ApplicationNumber 10-2013-0076708 filed Jul. 1, 2013, the entire contents of whichapplication is incorporated herein for all purposes by this reference.

BACKGROUND OF INVENTION

Field of Invention

The present invention relates to an all-in-one jigless projectionloading system and a body component assembling method using the same fora vehicle. More particularly, the present invention relates to anall-in-one jigless projection loading system and a body componentassembling method using the same for a vehicle body for assembling anadditional component to a vehicle body.

Description of Related Art

Generally, a vehicle body becomes a body-in-white (BIW) through aprocess in which various panels produced in ancillary processes areassembled.

A vehicle body is composed of a floor panel supporting a seat, a drivingportion including an engine and axles, and so on, and forming a lowersurface thereof, a pair of side panels forming right/left sides thereof,a roof panel forming an upper surface, a cowl panel, a back panel, apackage tray, and a plurality of roof rails.

Assembling the body components is performed in the body build-upprocess. The back panel is joined to the floor panel through a bodyassemble system, and then the pair of side panels, the roof panel, theroof rail, the package tray, and so on are assembled by welding in thebody build-up process.

Meanwhile, a worker initially stacks additional components loaded on apallet to a storage system in the body build-up process so as toassemble the additional components such as the cowl panel to the vehiclebody, which is formed by assembling the floor panel, the back panel, thepair of side panels, the roof panel, and so on.

Thus, the additional components are extracted from a storage system oneby one, and the extracted additional components are transferred througha sliding jig. In addition, each additional component is loaded to anarray/clamp jig in a state that the additional component is gripped by arobot gripper, is arrayed and clamped in the array/clamp jig, and iswelded to the vehicle body by a welding robot such that it is assembledto the vehicle body.

In the conventional art in which the additional components are assembledto the vehicle body through the above mentioned process, a space forinstalling the storage system, the sliding jig, the array/clamp jig, andthe welding robot may be required. Further, the cost of initialinvestment may be increased.

In addition, the entire working process may be complex as the variousprocesses from loading to welding the components in the conventional artare performed. Furthermore, loading of components to the vehicle bodymay be deteriorated as the body components are loaded with reference tothe jig in the conventional art.

The information disclosed in this Background section is only forenhancement of understanding of the general background of the inventionand should not be taken as an acknowledgement or any form of suggestionthat this information forms the prior art already known to a personskilled in the art.

BRIEF SUMMARY

Various aspects of the present invention provide for an all-in-onejigless projection loading system and a body component assembling methodusing the same for a vehicle, having advantages of realizing anall-in-one type of extracting, arraying, clamping, and welding the bodycomponents.

The all-in-one jigless projection loading system for a vehicle accordingto various aspects of the present invention is adapted to load andassemble a body component to a vehicle body. The all-in-one jiglessprojection loading system may include: a fixing bracket fixed to an armof a robot; a position adjusting member rotatably installed at thefixing bracket; a gripper installed at the fixing bracket to be movablebackward and forward, and gripping the body component; an array unitinstalled at the position adjusting member, and arraying the bodycomponent; and a welding unit installed at the fixing bracket, andprojection-welding the body component to a vehicle body.

The all-in-one jigless projection loading system may further include avideo camera installed at the position adjusting member and shootingvideo of the body component and the vehicle body to be assembled withthe body component, and outputting the video data to a controller.

The position adjusting member may be rotatably installed at the fixingbracket by a drive motor.

The controller may gain the video data from the video camera and analyzethe video data so as to control the drive motor.

The position adjusting member may be rotated by the drive motor, and mayadjust a loading position of the body component with reference to thevehicle body and an array position of the body component.

The gripper may include: a first adsorption gripper installed at oneside of the fixing bracket to be movable backward and forward by a firstoperating cylinder, and vacuum-adsorbing one side of the body component;and a second adsorption gripper installed at the other side of thefixing bracket to be movable backward and forward by a second operatingcylinder, and vacuum-adsorbing the other side of the body component.

The array unit may be installed at the position adjusting member to belinearly movable by a moving member, and may include a reference pincoupled to a tooling hole of the body component by a backward operationof the gripper.

The array unit may be installed at the position adjusting member to bemovable backward and forward by a clamp cylinder, and may include a pinclamp coupled to the other tooling hole of the body component by abackward operation of the gripper.

The welding unit may include: a first projection welding electrodeinstalled at the fixing bracket; and a second projection weldingelectrode installed at the fixing bracket to be movable.

The second projection welding electrode may be installed at the fixingbracket to movable for adjusting a pitch with the first projectionwelding electrode.

The welding unit may include: a mounting bracket fixedly installed atthe fixing bracket; a first welding cylinder fixedly installed at themounting bracket; and a first projection welding electrode connectedwith the first welding cylinder and adapted to be movable backward andforward.

The welding unit may further include: a moving bracket installed at themounting bracket to be movable; a second welding cylinder fixedlyinstalled at the moving bracket; and a second projection weldingelectrode connected with the second welding cylinder, and adapted to bemovable backward and forward.

In addition, the all-in-one jigless projection loading system for avehicle according to various aspects of the present invention is adaptedto load and assemble a body component to a vehicle body. The all-in-onejigless projection loading system may be mounted to an arm of a robot bya fixing bracket, and a gripper gripping the body component, an arrayunit arraying body components, and a welding unit projection-welding thebody component to the vehicle body may be integrally composed.

The all-in-one jigless projection loading system may include: a videocamera shooting video of the vehicle body to which the body componentand the body component are assembled, and outputting the video data to acontroller; and a position adjusting member controlled by thecontroller, and adjusting a loading position of the body component withreference to the vehicle and an array position of the body components.

Further, a body component assembling method for a vehicle may be adaptedto load and assemble a body component to a vehicle body by using theall-in-one jigless projection loading system. The method may include:(a) mounting the all-in-one jigless projection loading system at the armof the robot by the fixing bracket; (b) adsorption-gripping the bodycomponent by the gripper of the system, and arraying and clamping by thearray unit of the system; (c) transferring the body component to thevehicle body by the robot, and positioning the body component at a homeposition at the vehicle body; and (d) projection-welding the bodycomponent to the vehicle body by the welding unit of the system.

In (b), video of the body component may be shot by a video camera, thevideo data is outputted to a controller, and the position adjustingmember may be rotated by the controller such that a position of thearray unit is adjusted.

In (c), video of the vehicle body to be assembled with the bodycomponent may be shot by a video camera, resultant video data may beoutputted to a controller, and the position adjusting member may berotated by the controller such that a position of the body component isadjusted.

In (b), the body component may be adsorption-gripped according to thegripper being forwardly moved, and a reference pin of the array unit anda pin clamp may be coupled with a tooling hole of the body componentaccording to the gripper being backwardly moved.

In (c), a pitch between a first projection welding electrode and asecond projection welding electrode of the welding unit may be adjustedaccording to movement of the second projection welding electrode of thewelding unit.

The body component such as a cowl panel may be arrayed and clamped, andthe body component may be loaded and projection-welded to the vehiclebody.

The methods and apparatuses of the present invention have other featuresand advantages which will be apparent from or are set forth in moredetail in the accompanying drawings, which are incorporated herein, andthe following Detailed Description, which together serve to explaincertain principles of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a perspective view of an exemplary all-in-one jiglessprojection loading system for a vehicle according to the presentinvention.

FIG. 2 is a front view of an exemplary all-in-one jigless projectionloading system for a vehicle according to the present invention.

FIG. 3 is a rear view of an exemplary all-in-one jigless projectionloading system for a vehicle according to the present invention.

FIG. 4 is a top plan view of an exemplary all-in-one jigless projectionloading system for a vehicle according to the present invention.

FIG. 5 is a flowchart of a body component assembling method using anexemplary all-in-one jigless projection loading system for a vehicleaccording to the present invention.

DETAILED DESCRIPTION

Reference will now be made in detail to various embodiments of thepresent invention(s), examples of which are illustrated in theaccompanying drawings and described below. While the invention(s) willbe described in conjunction with exemplary embodiments, it will beunderstood that present description is not intended to limit theinvention(s) to those exemplary embodiments. On the contrary, theinvention(s) is/are intended to cover not only the exemplaryembodiments, but also various alternatives, modifications, equivalentsand other embodiments, which may be included within the spirit and scopeof the invention as defined by the appended claims.

In order to clearly explain the present invention, portions that are notdirectly related to the present invention are omitted, and the samereference numerals are used for the same or similar constituent elementsthrough the entire specification.

The size and thickness of each element are arbitrarily shown in thedrawings, but the present invention is not necessarily limited thereto,and in the drawings, the thickness of layers, films, panels, regions,etc., are exaggerated for clarity.

In the detailed description, components which have the same name aredifferentiated by ordinal numbers, but are not limited to the sequence.

In addition, unless explicitly described to the contrary, the word“comprise” and variations such as “comprises” or “comprising” will beunderstood to imply the inclusion of stated elements but not theexclusion of any other elements.

Further, the terms such as “ . . . unit”, “ . . . means”, “ . . . part”,or “ . . . member”, which are disclosed in the specification, refer to aunit of an inclusive constituent which performs at least one function oroperation.

FIG. 1 is a perspective view of an all-in-one jigless projection loadingsystem for a vehicle according to various embodiments of the presentinvention, and FIG. 2 is a front view of an all-in-one jiglessprojection loading system for a vehicle according to various embodimentsof the present invention, and FIG. 3 is a rear view of an all-in-onejigless projection loading system for a vehicle according to variousembodiments of the present invention.

As shown in FIG. 1 to FIG. 3, an all-in-one jigless projection loadingsystem 100 for a vehicle according to various embodiments of the presentinvention may be applied to the body build-up process for assemblingvarious panels produced in an ancillary body assembly process and thentransferred to a vehicle body.

For example, an all-in-one jigless projection loading system 100 for avehicle according to various embodiments of the present invention may beapplied to a process for assembling an additional component (referred toas “body component” hereinafter) such as a cowl panel to the vehiclebody which is formed by assembling the floor panel, the back panel, thepair of side panels, the roof panel, and so on in the body build-upprocess.

Herein, an all-in-one jigless projection loading system 100 for avehicle according to various embodiments of the present invention isprovided for precisely loading a body component 1 to a vehicle bodytransferred along a transfer line in a state that it is loaded to atransfer unit, and for assembling the body component 1 to the positionwhere the body component is loaded by welding.

The all-in-one jigless projection loading system 100 for a vehicleaccording to various embodiments of the present invention may be adaptedto integrally compose various constituent elements, and may be mountedat an arm 4 of a robot 3. Herein, the robot 3 is disposed in a workingspace formed at sides of the transfer line.

The all-in-one jigless projection loading system 100 for a vehicleaccording to various embodiments of the present invention is adapted toextract, array, and clamp the body component 1 loaded on a pallet, toload the body component 1 to a precise position, and to assemble thebody component 1 by projection-welding.

That is, the all-in-one jigless projection loading system 100 for avehicle is provided for realizing all-in-one extracting, arraying,clamping, and projection-welding the body component 1.

The all-in-one jigless projection loading system 100 includes a fixingbracket 10, a position adjusting member 20, grippers 33 and 43, an arrayunit 50, a welding unit 60, a video camera 80, and a controller 90.

The fixing bracket 10 is mounted at the arm 4 of the robot 3. Inaddition, the fixing bracket 10 is capable of being coupled to ordecoupled from the arm 4 of the robot 3. A tool changer having a generalstructure is mounted at the fixing bracket 10. That is, the tool changeris selectively coupled to the arm 4 of the robot 3.

Various constituent elements of various embodiments can be mounted atthe fixing bracket 10. The fixing bracket 10 is adapted to support theconstituent elements, and has various appendages such as a block, aplate, a housing, a cover, a collar, and so on.

However, the appendages are provided for installing each constituentelement to the fixing bracket 10. The appendages will be called fixingbrackets 10 except under special circumstances.

The position adjusting member 20 is provided so as to adjust a positionof the array unit 50, which will be explained in greater detail below.Substantially, the position adjusting member 20 is provided so as toadjust a position of the body component 1 arrayed and clamped at thearray unit 50.

Referring to the top plan view of an all-in-one jigless projectionloading system 100 for a vehicle according to various embodiments of thepresent invention shown in FIG. 4, the position adjusting member 20 isrotatably installed to the fixing bracket 10.

The position adjusting member 20 is installed to be rotatable in bothdirections by a drive motor 21, and is disposed as a rotation memberconnected with a rotation shaft of the drive motor 21.

Therefore, a loading position of the body component 1 with reference tothe vehicle body and an array position of the body component 1 and thevehicle body can be adjusted according to the position adjusting member20 being rotated in both directions by the drive motor 21.

The grippers 33 and 43 grip the body component 1 loaded on a pallet byadsorption, and may be installed at the fixing bracket 10 to be movableback and forth.

As shown in FIG. 2, the grippers 33 and 43 may include a firstadsorption gripper 33 installed at one side (an upper portion in thefigure) of the fixing bracket 10 and a second adsorption gripper 43installed at the other side (a lower portion in the figure) of thefixing bracket 10.

The first adsorption gripper 33 is disposed to be movable back and forthby a first operating cylinder 31, and the second adsorption gripper 43is disposed to be movable back and forth by a second operating cylinder41.

Herein, the first adsorption gripper 33 vacuum-adsorbs one side of thebody component 1 by air pressure, and may be installed to a firstoperating rod 35 of the first operating cylinder 31.

In addition, the second adsorption gripper 43 vacuum-adsorbs the otherside of the body component 1 by air pressure, and may be installed to asecond operating rod 45 of the second operating cylinder 41.

The first and second adsorption grippers 33 and 43 can grip the one sideand the other side of the body component 1 by air pressure according toforward movement of the first and second operating rods 35 and 45 of thefirst and second operating cylinders 31 and 41.

In addition, the first and second adsorption grippers 33 and 43 can movethe body component 1 toward the array unit 50 according to backwardmovement of the first and second operating rods 35 and 45 of the firstand second operating cylinders 31 and 41.

The array unit 50 is provided so as to determine an arraying referencepoint of the body component 1 gripped at the first and second adsorptiongrippers 33 and 43 and array and clamp the body component 1.

Referring to FIG. 1 to FIG. 4, the array unit 50 includes a referencepin 51 and a pin clamp 55.

The reference pin 51 is installed at the position adjusting member 20,and may be coupled with a tooling hole 5 of the body component 1 movedby the backward operation of the first and second adsorption grippers 33and 43.

Herein, the reference pin 51 is installed to be linearly movable by amoving member 53 according to a position of the tooling hole 5 of thebody component 1. The moving member 53 is an electric unit whichlinearly moves along one axis direction at the position adjusting member20.

The moving member 53 is a general LM transport unit (carrier) includingan LM motor 54 a and an LM guide module 54 b for moving along one axisdirection such that a detailed description thereof will be omitted.

The pin clamp 55 arrays the body component 1 and clamps the bodycomponent 1. In addition, the pin clamp 55 is installed to be movableback and forth at the position adjusting member 20, and may be coupledwith another tooling hole 7 of the body component 1 moved by thebackward operation of the first and second adsorption grippers 33 and43. That is, the pin clamp 55 is a clamping pin to move back and forthby a clamp cylinder 57.

The pin clamp 55 is well-known to a person of ordinary skill in the artsuch that a detailed description thereof will be omitted.

As shown in FIG. 1 and FIG. 4, the welding unit 60 is gripped by thegrippers 33 and 43, and is provided for projection-welding the bodycomponent 1 arrayed by the array unit 50 to the vehicle body by usingelectrical resistance.

The welding unit 60 includes a first projection welding electrode 61installed at the fixing bracket 10 and a second projection weldingelectrode 62 installed to be movable at the fixing bracket 10.

Herein, the first projection welding electrode 61 may be an anode andthe second projection welding electrode 62 may be a cathode in theprojection welding. In this case, the second projection weldingelectrode 62 may be installed at the fixing bracket 10 to be movable foradjusting a pitch with the first projection welding electrode 61.

The welding unit 60 according to various embodiments of the presentinvention will now be described in detail, and includes a mountingbracket 64 fixedly installed at the fixing bracket 10, a first weldingcylinder 66 fixedly installed at the mounting bracket 64, and the firstprojection welding electrode 61 connected with the first weldingcylinder 66 and adapted to be movable back and forth.

The welding unit 60 may further include a moving bracket 71 installed tobe movable at the mounting bracket 64, a second welding cylinder 73fixedly installed at the moving bracket 71, and the second projectionwelding electrode 62 connected with the second welding cylinder 73 andadapted to be movable back and forth.

In this case, the moving bracket 71 is an electric unit which linearlymoves along one axis direction by a moving member 75 at the mountingbracket 64. The moving member 75 may be a general LM transport unit(carrier) including an LM motor and an LM guide module for moving alongone axis direction.

The first and second projection welding electrodes 61 and 62 receivewelding current from a transistor 79 disposed at the fixing bracket 10,and can projection-weld the body component 1 to the vehicle body byusing electrical resistance.

As shown in FIG. 1 and FIG. 2, the video camera 80 according to variousembodiments of the present invention is installed as a pair at theposition adjusting member 20, they shoot video of the body component 1and the vehicle body to be assembled with the body component 1, and theyoutput the video data to the controller 90.

The video camera 80 may include a camera portion having an opticalsystem and shooting video of the body component 1 and a part of thevehicle body assembled with the body component 1, and a lamp portionradiating light toward the body component 1 and the part of the vehiclebody assembled with the body component 1.

The camera portion and the lamp portion of the video camera 80 arewell-known to a person of ordinary skill in the art such that a detaileddescription thereof will be omitted.

The controller 90 controls the entire operation of the system 100, andsimultaneously gains video data from the video cameras 80 and thenanalyzes the video data so as to control operations of the drive motor21 and the moving members 53 and 75.

That is, the controller 90 gains the video data of the body component 1and the vehicle body that will be assembled with the body component 1from the video cameras 80, and then analyzes the video data so as totransmit electrical control signals to the drive motor 21 and the movingmember 53 and 75.

Therefore, the drive motor 21 is driven by control signals of thecontroller 90, and can rotate the position adjusting member 20. That is,the position adjusting member 20 is rotated by the drive motor 21 suchthat a loading position of the body component 1 with reference to thevehicle body and an array position of the body component 1 aresubstantially adjusted.

The moving members 53 and 75 are driven by control signals of thecontroller 90, and can linearly move the reference pin 51 of the arrayunit 50, and can further move the second projection welding electrode 62linearly.

Hereinafter, a body component assembling method using the all-in-onejigless projection loading system 100 for a vehicle according to variousembodiments of the present invention will be described with reference tothe accompanying drawings.

FIG. 5 is a flowchart of a body component assembling method using anall-in-one jigless projection loading system for a vehicle according tovarious embodiments of the present invention.

Referring to FIG. 1 to FIG. 5, there is the state in which the vehiclebody is transferred along a transfer line to a working position at whichthe robot 3 is disposed.

In addition, the all-in-one jigless projection loading system 100 for avehicle according to various embodiments of the present invention ismounted to the arm of the robot 3 by the fixing bracket 10.

On this state, the system 100 is moved to the pallet on which the bodycomponent 1 is loaded by the robot 3 at step S11, and then the videocamera 80 shoots video of the body component 1 such that the video datais outputted to the controller 90 at step S12.

In addition, the controller 90 gains the video data of the bodycomponent 1 from the video camera 80 and analyzes the video data so asto transmit electrical control signals to the drive motor 21.

The drive motor 21 is driven by the control signals of the controller 90such that the position adjusting member 20 is rotated. Therefore, theposition adjusting member 20 is rotated by the drive motor 21 such thatthe position of the array unit 50 is adjusted at step S13.

Then, the system 100 is moved in a direction (for example, from an upperside to a lower side) toward the body component 1 of the pallet by therobot 3, and the first and second adsorption grippers 33 and 43 of thesystem 100 adsorb-grip the one side and the other side of the bodycomponent 1 by air pressure according to forward movement of the firstand second operating rods 35 and 45 of the first and second operatingcylinders 31 and 41 at step S14.

Subsequently, the first and second adsorption grippers 33 and 43 movethe body component 1 toward the array unit 50 according to backwardmovement of the first and second operating rods 35 and 45 of the firstand second operating cylinders 31 and 41.

Herein, the reference pin 51 of the array unit 50 is linearly moved to aposition corresponding to the tooling hole 5 of the body component 1 bythe moving member 53 as the electrical control signal is transmitted tothe moving member 53 by analyzing the video data of the body component 1through the controller 90.

Thus, the reference pin 51 may be coupled with the tooling hole 5 of thebody component 1 moved by a backward operation of the first and secondadsorption grippers 33 and 43. The pin clamp 55 of the array unit 50 maybe moved forward by the clamp cylinder 57 and be simultaneously coupledwith the other tooling hole 7 of the body component 1 moved by abackward operation of the first and second adsorption grippers 33 and43.

Therefore, the reference pin 51 and the pin clamp 55 are coupled withthe tooling holes 5 and 7 of the body component 1 moved by a backwardoperation of the first and second adsorption grippers 33 and 43, and anarraying reference point of the body component 1 gripped at the firstand second adsorption grippers 33 and 43 is determined so as to arrayand clamp the body component 1 at step S15.

In the state that the body component 1 is gripped by the first andsecond adsorption grippers 33 and 43 and is arrayed by the reference pin51 and the pin clamp 55 of the array unit 50, the body component 1 ismoved to the vehicle body to be assembled with the body component 1together with the system 100 by the robot 3 at step S16.

Thus, in the state that the body component 1 is positioned near thevehicle body to be assembled with the body component 1, the video of thevehicle body is shot by the video cameras 80, and then the video data isoutputted to the controller 90 at step S17.

The controller 90 gains the video data of the vehicle body from thevideo camera 80, and then analyzes the video data so as to transmitelectrical control signals to the drive motor 21.

Therefore, the drive motor 21 is driven by the control signals of thecontroller 90 such that the position adjusting member 20 is rotated, andthe position adjusting member 20 is rotated by the drive motor 21 suchthat the body component 1 is adjusted to a position corresponding to thevehicle body at step S18.

Subsequently, the body component 1 is moved to the vehicle body byoperation of the robot 3, and the body component 1 is positioned to ahome position with reference to the vehicle body such that the bodycomponent 1 is pushed at step S19.

In this case, the electrical control signal is transmitted to the movingmember 75 by analyzing the video data of the vehicle body through thecontroller 90 such that the second projection welding electrode 62 ofthe welding unit 50 is moved to a point corresponding to a weldingtarget point by the moving member 75 so as to adjust a pitch with thefirst projection welding electrode 61.

Subsequently, the first and second projection welding electrodes 61 and62 of the welding unit 60 are moved forward by the first and secondwelding cylinders 66 and 73, and simultaneously receive the weldingcurrent from the transistor 79 so as to projection-weld the bodycomponent 1 to the vehicle body by the electrical resistance at stepS20.

Therefore, the body component 1 such as a cowl panel is loaded to thevehicle body and assembled with the vehicle body by projection-weldingthrough the above-mentioned processes.

According to various embodiments of the present invention, the bodycomponent 1 loaded on the pallet is extracted, arrayed, and clamped bythe simple all-in-one system and method. In addition, the body component1 can be loaded to an exact position of the vehicle body, and can thenbe assembled with the vehicle body by projection-welding.

Thus, an installation space of devices becomes small, an investment costis decreased, man-hours are reduced, and the entire process becomessimple as the extracting, arraying, clamping, and welding of the bodycomponent 1 are realized by the simple all-in-one system and method.

Furthermore, the body component 1 is loaded with reference to thevehicle body according to various embodiments of the present invention,unlike a conventional art in which the body component 1 is loaded withreference to a jig, such that the loading of the body component 1 to thevehicle body is improved.

For convenience in explanation and accurate definition in the appendedclaims, the terms upper or lower, front or rear, and etc. are used todescribe features of the exemplary embodiments with reference to thepositions of such features as displayed in the figures.

The foregoing descriptions of specific exemplary embodiments of thepresent invention have been presented for purposes of illustration anddescription. They are not intended to be exhaustive or to limit theinvention to the precise forms disclosed, and obviously manymodifications and variations are possible in light of the aboveteachings. The exemplary embodiments were chosen and described in orderto explain certain principles of the invention and their practicalapplication, to thereby enable others skilled in the art to make andutilize various exemplary embodiments of the present invention, as wellas various alternatives and modifications thereof. It is intended thatthe scope of the invention be defined by the Claims appended hereto andtheir equivalents.

1-14. (canceled) 15: A body component assembling method for a vehicleadapted to load and assemble a body component to a vehicle body by usingan all-in-one jigless projection loading system, wherein the all-in-onejigless projection loading system comprises: a fixing bracket fixed to arobot arm; a position adjusting member rotatably mounted to the fixingbracket; a gripper mounted to the fixing bracket and movable backwardand forward, the gripper adapted for gripping the body component; anarray unit mounted to the position adjusting member, the array unitadapted for arraying the body component; and a welding unit mounted tothe fixing bracket, the welding unit adapted for projection-welding thebody component to a vehicle body, the method comprising: (a) mountingthe all-in-one jigless projection loading system on the robot arm by thefixing bracket; (b) adsorption-gripping the body component by thegripper of the system, and arraying and clamping by the array unit ofthe system; (c) transferring the body component to the vehicle body bythe robot, and positioning the body component at a home position at thevehicle body; and (d) projection-welding the body component to thevehicle body by the welding unit of the system. 16: The method of claim15, wherein, in (b), video of the body component is shot by a videocamera, the video data is outputted to a controller, and the positionadjusting member is rotated by the controller such that a position ofthe array unit is adjusted. 17: The method of claim 15, wherein, in (c),video of the vehicle body to be assembled with the body component isshot by a video camera, resultant video data is outputted to acontroller, and the position adjusting member is rotated by thecontroller such that a position of the body component is adjusted. 18:The method of claim 15, wherein, in (b), the body component isadsorption-gripped according to the gripper being forwardly moved, and areference pin of the array unit and a pin clamp are coupled with atooling hole of the body component according to the gripper beingbackwardly moved. 19: The method of claim 15, wherein, in (c), a pitchbetween a first projection welding electrode and a second projectionwelding electrode of the welding unit is adjusted according to movementof the second projection welding electrode of the welding unit. 20: Themethod of claim 15, wherein the body component such as a cowl panel isarrayed and clamped, and the body component is loaded andprojection-welded to the vehicle body.